I am attempting to register my Matrice 210 for commercial use with the FAA. Where do I find the Serial Number? My Phantom 4 Pro has it in the battery compartment and app. For the Matrice I am not seeing an SN anywhere.  Any help would’ve appreciated!

Either on QR sticker just above battery compartment at the back or when connected go into General settings About (right at the bottom) & should have serial number next to aircraft

Please find it in the rear of the aircraft and above the battery compartment, here is the picture for your reference.